At Tokyo in October the colt was dropped back to Listed class for the Icho Stakes over 1800 metres and won from Win Phoenix and ten others.

Ridden by Masayoshi Ebina he won in a race record time of 1:45.9 by a neck from Pray And Real with Clarity City a length and a quarter back in third place.

[8] On 24 February Isla Bonita began his second campaign in the Kyodo News Service Hai (a trial race for the Satsuki Sho) over 1800 metres at Tokyo.

[9] On his next appearance Isla Bonita, with Ebina in the saddle, was made the 4.1/1 second choice in the betting for the 74th running of the Satsuki Sho over 2000 metres at Nakayama Racecourse.

[12] After a three and a half months Isla Bonita returned in autumn for the St Lite Kinen (usually a trial race for the Kikuka Sho) over 2200 metres at Niigata on 21 September.

For his final run of 2015 the colt was dropped back in distance for the Mile Championship over 1600 metres at Kyoto Racecourse three weeks later and started favourite.

The horse returned from a four and a half month summer break to finish second to Young Man Power in the Grade 3 Fuji Stakes over 1600 metres at Tokyo in October.

[20] On his first run of 2017 Isla Bonita started second favourite behind Air Spinel in the Yomiuri Milers Cup over 1600 metres at Kyoto on 23 April in an eleven-runner field which also included Young Man Power and Fiero.

[21] On 4 June he started favourite for the Yasuda Kinen but was repeatedly denied a clear run in the straight and came home eighth of the eighteen runners behind Satono Aladdin.

[22] After the summer break Isla Bonita began his autumn campaign in the Fuji Stakes on 21 October and finished second, two lengths behind the winner Air Spinel.

He again encountered trouble in running before staying on strongly in the closing stages to finish fifth, one and a half lengths behind the three-year-old winner Persian Knight.

[23] On his final racecourse appearance Isla Bonita started the 3.1/1 second choice in the betting behind Mozu Ascot in an eighteen-runner field for the Hanshin Cup on 24 December.